The mayors of Greater Manchester and the Liverpool City Region are calling for a special convention to boost the northern economy:
Steve Rotheram and Andy Burnham want political leaders from across the North to come together in June.
They'll discuss rail investment, Brexit and devolution.
A £5 million campaign has been launched at Manchester Airport to boost the international profile of the North West.
It is estimated nearly 28 million passengers pass through its terminals each year.
A major publicity drive has been unveiled by Northern Powerhouse Minister Jake Berry.
Professor Jackie Oldham, from the University of Manchester, says the region must build on its strengths:
The Mayor of Greater Manchester has said he's "not surprised" by new figures which suggest that the North West gets less than half the transport investment allocated to London.
Andy Burnham says "packed out, clapped out" trains and poor roads are preventing the Northern Powerhouse from reaching its full potential.
We're making the case to the government to put the North of England to the front of the queue for new transport investment.
We can't carry on as we are, and we can't keep funnelling money into London year on year.
Politicians from across northern England are launching a new parliamentary group in an attempt to have a greater influence at Westminster.
The Northern Powerhouse all-party parliamentary group (APPG) aims to raise awareness of issues affecting the region and attract investment.
The group was set up by the Northern Powerhouse Partnership, the independent body chaired by former chancellor George Osborne to represent business and civic leaders in the region.
The APPG's chairman John Stevenson, Tory MP for Carlisle, said:
I am looking forward to driving this initiative in Parliament to increase investment in and awareness of the North as a place that drives business, skills and economic growth."
Liverpool city region's Labour mayor Steve Rotheram said: "It's vitally important that we build the widest possible coalition in support of economic rebalancing and that the case for the Northern Powerhouse is advocated consistently and robustly both within the North and at the centre of national political decision-making."
Northern Powerhouse Minister Jake Berry said:
We're beginning an exciting new chapter for the North and, in this new APPG, we have a coalition of dedicated MPs from across the political spectrum working with business leaders and local authorities to help drive growth and innovation in the Northern Powerhouse.
"Through working together, we will continue to turn the Northern Powerhouse into a globally recognised economy, delivering the very best of British innovation, skills, manufacturing and technology."
Andy Burnham and Steve Rotheram have called on Philip Hammond to prove he's serious about the Northern Powerhouse scheme by committing to major spending from the Government.
Our correspondent Ashley Derricott has this report:
George Osborne has said that some of Theresa May's advisers tried to airbrush his idea for a Northern Powerhouse from history.
Speaking exclusively to Granada Reports, the former chancellor and Tatton MP said Mrs May should now use the Conservative party conference in Manchester in October to commit her government to the North.
Our political correspondent Dan Hewitt has been reporting for a couple of weeks on the state of public transport in the North West.
You might remember he went from Manchester to a science park in Ellesmere Port on public transport - a journey that takes less than an hour in a car - it took Dan nearly two and a half hours.
That report was picked up by the media nationally - and clearly made its way across George Osborne's desk.
Dan spoke to Mr Osborne at the London Evening Standard's office for his only TV interview.
The Blackpool MP Paul Maynard is a government spokesperson on transport.
He says the government and Prime Minster are committed to the Northern Powerhouse, and it's safe in the their hands.
Business leaders say a lack of investment in transport in the north of England shows how we're being let down by the Government.
Figures published yesterday suggest the north has seen £59 billion pounds less spending over the last decade compared to the capital.
And yet the Government insists it's still committed to creating a Northern Powerhouse. Our political correspondent Daniel Hewitt takes up the story:
Andrew Percy, the Minister for The Northern Powerhouse, says Brexit can be a good thing for industry in the North West.
The MP was speaking at the conference for the Northern Powerhouse in Manchester.
He said local industries now need to look further away from Europe for business opportunities.
Confidence in the government's flagship Northern Powerhouse has dropped sharply since Brexit. Exclusive research from Ipsos MORI suggests people in the North West are not convinced the plans to better balance the domination of London are actually working.
But ahead of tomorrow's autumn statement, former Chancellor George Osborne has told us 'it won't happen overnight' and 'if we don't try we'll never succeed'.
Our political correspondent Joe Pike has the story:
The new franchise – the West Coast Partnership – will be responsible for services on both the West Coast Main Line from 2019.Read the full story ›